import java.awt.*;

public class DrawingArea extends Panel {
    public Image offimage;
    Graphics offgraphics;
    Dimension offdimension;
    int offsetx, offsety;
    ImagePalette ip;

    public DrawingArea(ImagePalette ip) {
	this.ip = ip;
    }

    public void paint(Graphics g) {
	
	Dimension d = size();
	int dim;
	
	if (offgraphics == null) {
	    setBackground(Color.black);
	    setForeground(Color.black);
	    offimage = createImage(d.width, d.height);
	    offgraphics = offimage.getGraphics();
	    offdimension = d;
	    System.out.println("Initialized drawing area...");
	    
	} else if ((offdimension.width != d.width) ||
		   (offdimension.height != d.height)) {
	    System.out.println("Resized drawing area...");
	    offdimension = d;
	    Image resizedimage = createImage(d.width, d.height);
	    offgraphics = resizedimage.getGraphics();
	    offimage = offimage.getScaledInstance(d.width, d.height, 
						  offimage.SCALE_SMOOTH);
	    MediaTracker mt = new MediaTracker(this);
	
	    mt.addImage(offimage, 7);
	    try{
		mt.waitForID(7);
	    }
	    catch (Exception e){
		System.out.println(e);
	    }
	    offgraphics.drawImage(offimage, 0, 0, this);
	    offimage = resizedimage;
	}
	g.drawImage(offimage, 0, 0, this);
    }
    
    public void update(Graphics g){  
	paint(g);
    }

    private void brush(int x, int y) {
	offgraphics.drawImage(ip.brush, x - (ip.brush.getWidth(this)/2), 
			      y - (ip.brush.getHeight(this)/2), this);
	repaint();
    }
    
    public boolean mouseDown(Event e, int x, int y) {
	brush(x, y);
	return true;
    }
    
    public boolean mouseDrag(Event e, int x, int y) {
	brush(x, y);
	return true;
    }

}